[1]ZHENG Yong,XIE Zujin.Present Status and Prospect of Earthquake Focal Depth Locating[J].Journal of Seismological Research,2017,40(02):167-175.
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Present Status and Prospect of Earthquake Focal Depth Locating
Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume:
40
Number of periods:
2017 02
Page number:
167-175
Column:
Public date:
2017-04-23
- Title:
- Present Status and Prospect of Earthquake Focal Depth Locating
- Keywords:
- focal depth relocating; arrival time locating; waveform modeling; depth phase; joint inversion
- CLC:
- P315.3
- DOI:
- -
- Abstract:
- Earthquake focal depth locating is always a key project in seismology. Precise focal depth is of critical importance for evaluating seismic hazard,deciphering dynamic mechanism of earthquake generating,estimating aftershock evolution and risk,as well as monitoring nuclear tests. However,how to determine an accurate focal depth is always a challenge in seismological studies.Aiming at solving these problems,we analyzed and summrized the present status and the future development of earthquake focal depth locating.In this paper we first reviewed the present status of focal depth locating in the world,and made a summary of the frequently-used relocating methods and ideas at present,and introduced two types focal depth relocating ideas:arrival time relocating and waveform modeling methods. For these ideas,we systematically described the S-P and the Pn-Pg methods that belongs to arrival time method,and polarization focal depth locating and amplitude focal depth locating that belongs to waveform modeling,and further analyzed the advantages and limitations of these methods. Since the depth phase methods are highly sensitive to focal depth,and are relatively free from the uncertainties of crustal models,we mainly reviewed the depth phases of sPmP,sPL,sPn,and sSn,and quantitatively evaluated their availabilities and characteristics. Second,we also discussed the effects of crustal velocity model on the reliability of focal depth locating,and reviewed the advancements of seismic tomography techniques over recent years. Finally,based on the present status of the progresses on the focal depth locating,and the studies of seismic velocity structures,we proposed an idea of combining multiple datasets and relocating methods,jointly utilizing seismologic and geodetic techniques to relocate focal depth,which should be the major research field in investigating focal depth and source parameters in the near future.
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2017-06-10